12691791 has 48 divisors (see below), whose sum is σ = 23063040. Its totient is φ = 6557760.

The previous prime is 12691781. The next prime is 12691793. The reversal of 12691791 is 19719621.

12691791 is digitally balanced in base 2, base 4 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12691791 - 2¹⁰ = 12690767 is a prime.

It is a super-2 number, since 2×12691791² = 322163117575362, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

12691791 is strictly pandigital in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12691793) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27301 + ... + 27761.

It is an arithmetic number, because the mean of its divisors is an integer number (480480).

Almost surely, 2^12691791 is an apocalyptic number.

12691791 is a deficient number, since it is larger than the sum of its proper divisors (10371249).

12691791 is a wasteful number, since it uses less digits than its factorization.

12691791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516 (or 513 counting only the distinct ones).

The product of its digits is 6804, while the sum is 36.

The square root of 12691791 is about 3562.5539995907. The cubic root of 12691791 is about 233.2603756029.

The spelling of 12691791 in words is "twelve million, six hundred ninety-one thousand, seven hundred ninety-one".